Device for controlling the needle-loop on overseaming sewing-machines.



R. e. woonwmn. DEVICE FOR CONTROLLING THE NEEDLE LOOP 0N OVEBSEAMING SEWING MACHINE.

APPLICATION FILED JULY 23, l9 02.

Pa tented Sept, 22, 1908.

. [Juvehku' UNITED STATES PATENT OFFICE.

.RUdSlCL (L'WUODll'ARD, OF WA llKlXiAlN, ILLINOIS, ASSIUNOR T UNION SPECIAL SEWING MAGHINE COMPANY, OF CHICAGO, ILLINOIS. A. CORPORA'IHlN OF ILLINOIS.

DEVICE FOR G iONTROLLING THE NEEDLE-LOOP ON OVERSEAMING SEWING- MACHINES.

Specification of Letters Patent.

Patented Sept.'22, 1908.

Application filed July 23, 1902. Serial No. 116,628.

To all whom it may concern:

Be it known that I, RUSSEL G. WooD- wAnn, a cltizen of the United States, residing at lVaukegan, in the county of Lake, State of.

in patent of Lansing Onderdonk and my self, granted November. 27, '1906, Number.

837,106, and in an application filedby myself on February 18th, 1902, Seria'l'No.

In practice, it has been found that the different kinds of threads used in the needle form different sizes of loops. This variation is. quite frequently the cause vof skipped stitches." A small needle loop is better than a large one, as the spreader engages the loop to catfizy it up into the path of the looper, in-fi stead. of passing into it.

. It is the object of thepresent invention to provide for this variation, and I construct the'right'hand eyelet which cooperates with.

the traveling eyelet on the looper support, so that it canbe adjusted backward and forward parallel with the-line of feed; thusvarying therelation between the outer end of the swinging thread-carrying armand the eyelet, so that as'the needle begins to ascend to throw out the loop, a greater or less 40 amount of the slack thread is taken up, thus varying the size'oi the loop. Moving the eyelet towards the front of the machine reduces the size of the loop, and towards the rear of the machine increases it.

The invention, therefore, consists in a machine of the character described, having a needle, a looper, and a spreader, of .a coirtroller for the needle loop, including a movable arm projecting into the path of two cycso'lets, and arranged as it passes in one direction beyond the line joining the two cyclcts to pull off thread,.and as it passes in the other direction beyond theline joining the two cyclets, to pull up the thread from the needle;

drawn up from t the eyelet which is adjacent to it when its latter action is taking place, being adjustable toward and from 'the front of the machine,

thereby varying the amount of thread s needlefand consequently the size of the needle loop.

Furthermore, theinvention consists in the matters hereinafter described, and referred to in the appended claims.

The invent-ion is illustrated in the accom-- panying drawings, in which I Figure 1 is a front view of a Union Special single interlock machine, with the bed plate and most of the mechanism broken away, leaving only sufficient of the mechanism to enable one to get a clear understanding of my invention, Fig. 2 is a detail perspective view showing my improved mechanism for controlling the needle loop. Fig. 3 is a top plan view partly in section, of the parts of my ma chine shown in Fig. 1. It 18 not necessary to refer herein, except in a general way, .to the various'clements of the machine, other than those which form the featilres'of'the present invention. It will be sufficient to refer for a more detailed description of those parts not herein specifically described and claimed, to the patent and application above mentioned.

The shape of the machine is that of the well known Union Special'type, being the gooseneck, D the needle lever, E the needle bar,

the needle bar carrier.

'N is the needle, L the looper, and S spreader or-looping hook, the parts being so constructed ,and operating that the loop thrown-out/by the needle below the wor plate is seized by the spreader or looping hook S, and carried above the work plate to a point where thelooper L in its oscillatory movement passes into it, and carries its own thread into-position to be engaged by'the needle in its next descent. The looper L is attached to an oscillating shaft M, and'has, suitably connected with its upper-end, so-as to oscillate with it, an arm 100, 'havingan eyelet 101, in its outer end. This movable arm is adjustably securedat its rearend. through ,the slot 102 andscrew103, to an oscillat ng head, to which the looper supporting shaft is attached. A pointcr 105, sccured atits rear end by screw 106, serves to indicate tothe operator the amount of a justment of the movable arm 100.

. wardlyticularly described.

place.

of the machine, the goose neck being milled out to afford a seat for this adjustable eyelet 84. Another stationary eyelet 88, is proxvid'ed on the upper needle'bar lug.

The other parts of the apparatus shown are substantially the same as illustrated in my application ho. 951,599, above referred to, and the operation, is as follows: Assuming the needle bar at lOWGSbPOSltlOD, and'al: out to ascend so that the needle may throw out a loop, the intermittent nipping device (1/, c, f,

has been closed by the downward swing of 'the forward end of the needle lever, through the projection g, thus no thread is being drawn from the spools, and that portion of the thread which extends between the needle bar lug eyelet and the left hand eyeleton the goose neck, is engaged by the friction clamp,

, or so-called thread pick up G, the action of" which is. the same as set, forth in case, Serial No. 94,599 and need As the needle bar .rises the pick up device lightly holds the thread and pulls it through the eye of the needle and straightens out the kink which might be formed gaged by the point of the spreader, but releases it practically as soon as this engagement of spreader and needle loop takes 'The action of the supplemental pull off g between the nipping device and the tension, is the same as referred to in the aforel 100 acts by the swingingot said arm past the until it reaches the limitsaid application. v part of the present invention, which relates entirely to thecooperation of the movable arm 100 with the eyelets 85 and 84.

As thef needle bar reaches its highest point, and begins to descend, the looper meanwhile having passed into the needle loop'on'the spreader, the main pull ofi or movable arm eyelet 85 to pull off thread from the spools, of its swing to the I left, at whichtime the nipper springs have closed. In the opposite movement of the movable arm, when said arm has passed back of the line joining he eyelets 84 and 85, and the needles are ascending to throw out the loop, said arm acts to take up the slack in the needle thread, and it is in this connection that the present invention is of great value.

.lt is desirable that the spreader should not into the needle loop, but simply engage to carry it up into .the path of the needle, and for this reason, it is desirable that the a needle notbe herein more par in throwing out the loop, and causesv the loop to be properly positioned to be en- These features form no needle should throw out asmall rather than i a large loop, and means should be. provided for varying the size of this'loop, in accord ance with the dilicrent kinds and sizes of threadused. By providing the eyelet S4 with a forward and backward eyelet adjust-- ment parallel with the feed, it will be readily l seen that the movable arm 1.00, may be made i to take up greater or less quantity of slack l in the. needle thread, according as the eyelet is adjusted to ard the trout or toward the back o'ft'he machine. That is, by regdlating the distance that the movable arm moves out of the vertical plane through a line con necting the eyelets 84, S5, in its bm-kward. movement the amount of thread taken up by said arnnwill be varied.

Having thus described my invei'ition, what I claim as new, and desire to secure by Let-- ters Patent, is'.-

1. In a sewing machine, in combination with a needle adapted in its receding movementto throw out a loop, a loop taking device adapted to engage the needle loop, and adjustable means acting upon the needle thread during the receding movement of the for pulling the needle thread through the eye of the needle and regulating the size oi the loop .as it is thrown out thereby substantially as described;

In an overseaming sewing machine, stitch forming mechanisn'i including a needle adapted, in its receding movement to throw out a loop, a thread-carrying looper and a spreadeij adapted to engage the needle loop, and 'r it into position to be entered by the looper, and adjustable means acting upon thcneedlc thread'during the receding movemen't oi the needle for pulling the needle thread through. the eye of the needle and. regulating the size of the loop as it thrown out by the needle; subst anilia ly as described lln 'a sewing machine, in, combination with a needle adapted to throw out a loop, 1 and a loop-taking device, means lor regulating the size of the loop acting upon the needle thread before the loop-taking device engages the loop, said means for regulating the size oibthe loop being provided with an adjustable member; substai'itially as described. 1 4. In a sewing machine, in combination with a needle adapted to throw out a loop, l

and. a loop-takii'ig device, a movable member, an eyelet cm'ipcratin therewith, whereby said movable member in passing back of: said eyelet takes up the slack in the needle thread, said eyelet being adji'ist-able back and forth, whereby the relative distance of the movable arm from the eyelet changed, and the size of the needle loop regulated substantially as described.

5. In a machine of the character described,

having stitch forming mechanism including a thread carrying needle, a looper, and a spreader adapted to engage the needle loop seams 3 and carry it into position to be engaged l ,1 the looper, of means acting upon the needle 'thread for varying the size of the loop thrown out by saidneedle before thespreader engages the same; substantially as described.

6. A machine of the character described, having stitch-forming mechanism including aneedle, a looper, and a spreader, ofa con. 'troller' for the needle loop including a movable arm, eyeletslupon either side of saida spreader, a movable arm acting upon the needle thread, eyelets upon either side thereof into the path of which the movable, arm projects, said movable arm acting when moving in one direction to pull off thread,

and acting in the other direction to take up slack in the needle thread, and means for adjusting the eyelet which is adjacent'to it when the latter action is taking lace, thereby varying the size of'the need e loop; substantially as described.

8. In a sewing machine, a needle thread controlling device including a stationary eyelet, an adjustable eyelet, a swinging eyeletlocated between said stationary eyelet and said adjustable eyelet, and moving from aposition adjacent oneof said eyelets to a position adjacent the other of said eyelets, means for adjusting the position of the adjustable eyelet towards and from the stationary eyelet, whereby the amount 01 thread taken up by the swinging eyelet, may be varied.

In testimony whereof I aflix my signature in presence of two witnesses.

RUSSEL G. WOODWARD. Witnesses:

' CHESTER MCNEIL,

EMMA KERN. 

